diff options
Diffstat (limited to 'gst/audiofx/audiowsinclimit.c')
| -rw-r--r-- | gst/audiofx/audiowsinclimit.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/gst/audiofx/audiowsinclimit.c b/gst/audiofx/audiowsinclimit.c index 50d0c0f9..c8b7beb2 100644 --- a/gst/audiofx/audiowsinclimit.c +++ b/gst/audiofx/audiowsinclimit.c @@ -30,7 +30,31 @@ * when using FFT convolution as currently the convolution itself * is probably the bottleneck * - Maybe allow cascading the filter to get a better stopband attenuation. - * Can be done by convolving a filter kernel with itself. + * Can be done by convolving a filter kernel with itself + * - Drop the first kernel_length/2 samples and append the same number of + * samples on EOS as the first few samples are essentialy zero. + */ + +/** + * SECTION:element-lpwsinc + * @short_description: Windows Sinc low pass and high pass filter + * + * <refsect2> + * <para> + * Attenuates all frequencies above the cutoff frequency (low-pass) or all frequencies below the + * cutoff frequency (high-pass). The length parameter controls the rolloff, the window parameter + * controls rolloff and stopband attenuation. The Hamming window provides a faster rolloff but a bit + * worse stopband attenuation, the other way around for the Blackman window. + * </para> + * <title>Example launch line</title> + * <para> + * <programlisting> + * gst-launch audiotestsrc freq=1500 ! audioconvert ! lpwsinc mode=low-pass frequency=1000 length=501 ! audioconvert ! alsasink + * gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! lpwsinc mode=high-pass frequency=15000 length=501 ! audioconvert ! alsasink + * gst-launch audiotestsrc wave=white-noise ! audioconvert ! lpwsinc mode=low-pass frequency=1000 length=10001 window=blackman ! audioconvert ! alsasink + * </programlisting> + * </para> + * </refsect2> */ #ifdef HAVE_CONFIG_H |